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Add docs for tls-additional #1981

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16 changes: 16 additions & 0 deletions docs/getting-started/installation-and-upgrade/resources/add-tls-secrets.md
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Expand Up @@ -42,8 +42,24 @@ kubectl -n cattle-system create secret generic tls-ca \

The configured `tls-ca` secret is retrieved when Rancher starts. On a running Rancher installation the updated CA will take effect after new Rancher pods are started.

The certificate chain must be properly formatted, or components may fail to download resources from the Rancher server.

:::

## Adding Additional CA Certificates

If you are using a node driver which makes API requests using a different CA than the one configured for Rancher, additional root certificates and certificate chains can be added.

Create a unique file ending in `.pem` for each certificate that is required, and use kubectl to create the
`tls-additional` secret in the `cattle-system` namespace.

```
kubectl -n cattle-system create secret generic tls-additional \
--from-file=cacerts1.pem=cacerts1.pem --from-file=cacerts2.pem=cacerts2.pem
```

These CA root certificates and certificate chains will be mounted into the node driver pod during provisioning.

## Updating a Private CA Certificate

Follow the steps on [this page](update-rancher-certificate.md) to update the SSL certificate of the ingress in a Rancher [high availability Kubernetes installation](../install-upgrade-on-a-kubernetes-cluster/install-upgrade-on-a-kubernetes-cluster.md) or to switch from the default self-signed certificate to a custom certificate.